def main():
    n = eval(input("Enter a nonnegative integer: "))
    print("Factorial of", n, "is", factorial(n))


# Return the factorial for the specified number
def factorial(n):
    if n == 0:  # Base case
        return 1
    else:
        return n * factorial(n - 1)  # Recursive call


main()  # Call the main function
